The company, which has been trying to position itself as an upmarket alternative to the rise of private hire apps, is also investing considerably in driver training. In November, Addison Lee announced it was plugging £7.5m into an in-house driver training programme.

It has more investments lined up too. In March, the firm will open a new £5bn centre to service its 5,000 vehicles and support its 4,500 drivers, as it bids to ramp up both the level of service it offers, and the level of safety.

Chief executive Andy Boland said: “It has been an amazing twelve months for Addison Lee. Our vision of creating the world’s first truly global ground transportation service is coming to fruition and we are providing all our customers with a premium offer backed by a truly extraordinary level of service.”